Aristidoideae
Aristidoideae. -- This subfamily has a morphological synapomorphy of a spikelet with one floret and three lemma awns joined basally in a column. It consists of only 3 genera, Aristida L. (315 species), Stipagrostis Nees (55 species) and Sartidia De Winter (4 species) (GrassWorld). All three genera of the subfamily are monophyletic, based on chloroplast and nuclear DNA sequence data (Cerros, Columbus & Barker 2008), but the sections of Henrard are not monophyletic (Henrard 1926-1933, Henrard 1929-1933).
